Blindstitch sewing-machine.



4W. ARBETTER.' BLINDSTITGH SEWING MACHINE. APPLICA-*T1011 FILED FEB. 1,190Bv.

' Patented Oct. 19,1909.

. 2 SHEETS-SHEET 1 W'. ARBBTTER. BLINDSTITUH SEWING' MAEINB.

APPLIGATION FILED FEB. 1,1908.

Patented Oct. 19,' 1909. z smmTs-sffmm 2.

, upon Vmachines of essere.

entran arras Fr WOLF ARBETTER, OF CHELSEA,

MASSACHUSETTS, ASSIGNOR nnte T0 ARBETTER FEILINC-i` MACHINE COMPANY, 0F BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE. j

Bmnnsrmci-r Smyrne-Macerata To all whom it may concern:

Be it known that l, lVoLF Annn'rrnn, a'

citizen of the United States, residing at Chelsea, in the county of Suiolk and, State* of Massachusetts, have invented an Improvement in Blindstitch Sewing-Machines, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to a machine for making blind stitches, and is designed particularly for use in felling, padding and other similar sewing work in. the manufacture of clothing. lt is an 'improvement the general type illustrated in patent to Arbetter No. 830,699, granted September 11, 1906.

The invention is 4more particularly concerned with the stitch-forming mechanism proper, and will be apparent from the accompanying description and drawings and be dened in the appended claims; I

The drawings represent the upper or head portion of a sewing machine embodying the invention In the drawings, Figure l is a front. elevation of the head of the sewing' machine with the face-plate removed and showing a portion of the Work-support; Fig. 2 is a side elevation partially in cross-section of the parts shownfin Fig. l; Figs. 3 and 4 are `mechanism proper and forward end ofthe v enterin diagrammatic views -to which reference' will be made.

For the purposes of this invention it isl plate, including .the .feeding mechanism, the

, means for driving the different mechanisms of the sewing machine, or in fact anything but the forward portion of the sewing machine head containing the stitch-forming the parts immedietely associated therewith.'

In the drawings, A represents the head or overhanging arm of the machine provided Witha face-plate which is here shown as emoved to expose the interior parts, and which is held in position by screws lthe holes (n ln the type of machine ilustrated a presserfoot supported from the resser-foot carrier (It by the screw d is 'rigi ly connected to the head A, being adjustable vertically by means of lock-nuts, one of which is shown atL l5. all as set'y forth Specification of Letters Patent. Application led February l, 1908. Serial No. ll.

Patented oca. is, ieee.

in said patent. The Work-support Efthe bender G, the .feeding mechanism (not shown) may all be of the type illustrated in the saidv patent, but asthey are not made the subject of this invention it is' unnecessary to describe them further.4

The main driving shaft A3 zontally through the head and is provided at its forward end with a pinion C', adjustably connected thereto'by the set-screws 01.

On the face of the inion C is mounted a rotarily adjustable disk B to which is eccentrically connected the needle-operating rod B2. A grooved cam c4 is mounted on a stubshaft c, and driven from the pinion C by a gear C intermeshing therewith.

A verticalrock-shaft B1 is mounted in the lower portion of the head and carries at its lower end a long transverse bearing B8. A needle-carrying rock-shaft B7 is supported in said bearing, and provided at its outer end with a rock-arm B", to which, by meansv of a ball and socket joint, the needle-operating rod B2 already described is connected. The other end of the needle-carrying rock-shaft BT carries fastened thereto by means oi'.a setscrew b a needle-carrying arm b. At the outer end'otthe vneedle-carrying arin b is mounted a curved needle a, whose curvature is substantially' concentric with the axis of the shaft B7.

The vertical rock-shaft B10 has adjnstably connected thereto at its upper end within the head by means of a set. screw s, a slotted rocker-arm S. At the rear of the head A a short vertical rock-shaft T is mounted in a suitable bearing in the head and is provided at its lower end, adjustably connected thereto by a set-screw t, with a rocker-arm T. The rocker-arm T carries on its upper side a stud Tn which rides in the groove of the cam et, and said arm is also slottedlongitudinally and a sliding carrier T2 is mounted in said slot and adjustable longitudinally therein by means of the' screw TP'. The carrier T2 has pivotally mounted4 thereon a stud T4, which enters the slot of the rocker-arm S. 4

The details of that portion of the stitch'- forining mechanism complemental to the needle it is unnecessary to describe. Such mechanism is herein 'shown as similar to that in the said patent, as comprising a framework A8, a revolving hook rz an contained bobbin and case an* rotating in a plane transverse and oblique to the paths of oscillation extends-.horiof the needle', and transverse and obliti'ue to vthe worl'r-support, The. revolving hook may be -operated from the main driving-shaft by the means described in the said patent.

It will be observed by reference to the drawings that the axis of the shaft B7 is shown as a considerable distance to the rear of the axis of the vertical rock-shaft B10, and that the axis of the rotary hook is shown at a distance to the left of the axis of the vertical rock-shaft B1", and this construction is an important part of the present invention. The machine of this invention is designed, as in the case of the one shown in the patent already referred to, to make two stitches, one in the direction of the feed of the maierial, and one at an angle thereto, the said stitches usually being made alternately, and in the case of felling work the straight stitch is taken into the foundation fabric' parallel with, and closeto the edge'of the fold or superimposed layer, while the diagonal stitch enters the edge or under the edge of the up per layr and emerges from the upper surface of the said layer. l

In order to secure speed and simplicity of Operation'of the parts it is desirable to have the axis of the revolving hook or other looper mechanism fixed in position, but capable of cooperating with the needle on both'the straight and diagonal thrust to form the stitches. The smaller the angle between the paths of oscillation of the needle in making the straight and the diagonal stitch the more readily can the cooperation of the looper with the needle be secured. But it is necessary that the needle should penetrate a certain distance into the material in making the diagonal stitch in order to secure satisfactory Work. Thisvinvention provides for securing the requisite penetration of the needle in making the diagonal stitch,` and at the same time the minimum divergence of the needle from a straight line by disposition of the axesalready described. By placing the v axis of the rock-shaft BT in the rear of the axis of the vertical rock-shaft B10 the needle will be swung bodily about the vertical axis of the shaft B10 and in a circle whose radius is that of the distance -between the axesl of the shafts B7 and Bt". This distance will i depend somewhat upon circumstances, but

`of oscillation of the needlesubstantially because this distance between the paths is designed to be slightly adjustablewand the looper should be as close to the, needle is possible and yet avoid any danger from the hook catching in its own thread after feeding has taken place.

The advantages of the arrangement of the y""thrust of the needle, .4. the axis of the looper axis described will perhaps better appear by observing Figs. 3 and 4 of the drawings, where l represents the axis of the vertical shaft B1", 2 the straight, and 3 the diagonal 3 5 thefpoint of engagement of the looper with the needle on the straight thrust, G the point of engagement of the looper with the needle on the diagonal thrust. ln Fig..3 the axis of the shaft BT is represented as intersecting i that of the shaft B10 at the point 1, and hence the needle has no bodily swinging movement but simply turns on the axis 1, and in this Iway in order to secure a given depth of penetration .fc or a given distance of emergence on the diagonal stitch from the straight stitch makes the maximum angle of divergence. This throws the points of cooperation with the looper 5 and G very far apart, thus making it extremely ditlicult to secure proper coperation of the looper and needle. Tn F ig. 4, where the conditions are otherwise the same but the axis of the shaft B7 is rearward by three-eighths of an inch of the axis of the shaft Bw, the needle has a bodily swinging movement on an arc of the circle 7, and hence in order to secure the same given depth of penetration a; or a given distance of emergence on the diagonal stitch from the straight stitch, the angle between the straight and diagonal stitch is minimized and the points 5 and (5 brought so close together that when the axis 4f of the shuttle is arranged substantially midway therebetween a ready-and proper coperation of the looper with the needle is secured in the making of both stitches.

The screw 'l`3 and connected parts already described enables an adjustment to be lnade of the angle between the straight and diagonal stitches for different kinds of work without disturbing the position of the. needle in making the straight stitch which it is desired to maintain. This is secured by adjusting the arms T', S, on their respective rock-shafts so as t0 be in line when the needle is in position for making the straight stitch. Then when the screw T3 is moved to shift. the position of the stud T4 and colisequently the throw of. the arm S, the position of the needle in making the diagonal stitch Awill alone be varied. By this means an accomprising, in combination, a needle and means for oscillating` the same, means for bodily swinging the needle to cause its oscillati'ons to' occur in diverging paths, the axis of said oscillating movement being vlocated to the rear of. the axis of its swingingmovement.

A2. A. sewing machine for blind stitching comprising, in combination, a needle and means for oscillating the same, means for bodily/swinging the needle to cause its Aoscillations to occur in diverging paths, the laxis ofsaid oscillating movement being located to the rear of the axis of its swinging movement, complemental stitch-forming mechan- 'ism including a looper movingtransversely to the paths of oscillation of the needle, the

central point o the said loopers movementv being substantially midway the diver-ging paths of the needle.

3.. A sewing machinev for blind stitching comprising, in'combination, a curved needle and means for oscillating the same, means for bodily swinging th-e needle to cause its oscillations to occur in diverging paths, the axis of said .oscillating movement being located to the rear of the axis of its swinging movement.

4. A sewing machine for blind stitching comprising, in combination, a curved needle .and means for oscillating the same, means for bodily swinging the needle `to cause its oscillations to occur in diverging paths, the axis of said oscillating movement being lo cated to the rear of the axis of its swinging movement, com lemental stitch-forming mechanism inclu ing a looper moving transvetsely to the paths of oscillation of the needle, the central point of the said loopers movement being'substantially midway thc diverging paths ofthe needle.

`5. A sewing machine for blind stitching comprising, in combination, a vertical rock shaft and means for rocking it, a needlecarrying rock-shaft supported by, and transversely ofsaid vertical rock-shaft with its- .,axis in the rear of that of the vertical rockshat, a curved needle mounted on said needlesc'arrying rock-shaft, and complemental stitch-forming mechanism coperating therewith.

6. A sewing machine for blind stitching comprising, in combination, a vertical rocksliaft' and means for rocking it, a needlecarrying rock-shaft supported by, and trans'- lversely of said vertical rock-shaft with its axis in the rear of that of the vertical rock A name to this specification, in the presence of two subscribing witnesses.

WOLF ARBETTER. Witnesses: MABEL PAn'rcLow,

THOMAS J. DRUMMOND. 

